CN220585468U - High-capacity battery - Google Patents

Abstract

The utility model relates to the field of batteries, in particular to a high-capacity battery. The problem that the existing high-capacity battery sharing pipeline assembly is difficult to assemble is solved. The solar cell comprises a shell and n single cells, wherein the n single cells are sequentially connected in parallel and are arranged in an inner cavity of the shell; each single battery cavity comprises an electrolyte area and a gas area; wherein n is an integer of 2 or more; the bottom of the shell is provided with an electrolyte sharing chamber; the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries; the side wall of the shell is provided with a gas sharing cavity; the gas sharing chamber is communicated with the gas area of the inner cavity of each single battery. The electrolyte sharing chamber does not need to be inserted, and has lower requirements on processing precision and assembly precision. Meanwhile, the side wall of the shell is also provided with a gas sharing cavity, and the gas sharing cavity is communicated with the gas areas of the inner cavities of all the single batteries in the shell to achieve gas balance, so that the gas sharing of all the single batteries can further ensure the consistency of all the single batteries.

Description

High-capacity battery

Technical Field

The utility model relates to the field of batteries, in particular to a high-capacity battery.

Background

In the market, a plurality of single batteries are connected in parallel or in series to form a large-capacity battery (also called a battery module or a battery pack).

The structure of the existing high-capacity battery is shown in fig. 1, and the structure of the existing high-capacity battery comprises a battery pack main body formed by connecting a plurality of single batteries in parallel and a shared pipeline assembly positioned at the bottom of the battery pack main body; and the shared pipeline component is used for completely penetrating the inner cavities of the plurality of single batteries so that all the single batteries in the battery pack are in an electrolyte system. The uniformity of each single battery electrolyte in the battery pack can be enhanced through the shared pipeline assembly, the cycle life is prolonged, the service life of the battery pack can be prolonged, and the use safety of the battery pack is improved.

However, the shared pipeline assembly is formed by directly performing sealing and splicing on the multi-section sub pipeline 01 and the intermediate connecting pipe 02 in interference fit; at this time, the multi-section sub-pipelines 01 are arranged on the lower cover plate 03 of the single battery one by one, extend along the arrangement direction of the single battery 1, are integrally extruded with the lower cover plate 03, and are communicated with the openings of the lower cover plate 03.

During assembly, two ends of the sub-pipeline 01 are used as connecting ends of the middle connecting pipe 02, and when two single batteries are connected, one ends of the sub-pipelines on the two single batteries are respectively extruded into the two ends of the middle connecting pipe 02.

The shared line assembly requires the sub-lines 01 and the intermediate connection pipe 02 to be coaxial during the plugging process, so that effective connection can be achieved, however, the coaxiality of the sub-lines and the intermediate connection pipe 02 is difficult to ensure due to the following reasons:

1) The sub-pipelines and the lower cover plate are integrated, if the positions of the sub-pipelines on the lower cover plate are slightly deviated on each integrated part, or the sizes of the sub-pipelines are slightly deviated, the coaxiality of the sub-pipelines is deviated when the sub-pipelines are spliced;

2) When the integrated piece is welded with the cylinder, the situation that the positions of the sub pipelines relative to the cylinder are inconsistent can possibly occur due to the difference of welding processes, and therefore, the coaxiality of each sub pipeline is deviated when the sub pipelines are spliced;

3) According to the scheme, when the plug-in type pipeline is plugged, a special tool is needed, and due to improper use of the tool or a slight carelessness of constructors, the coaxiality of each sub pipeline is deviated;

in addition, when in plugging, the deviation among the sub-pipelines can be increased along with the increase of the plugging quantity, so that the coaxiality among the sub-pipelines is more difficult to ensure as the plugging quantity is increased; resulting in a decrease in yield with an increase in the number of pins during assembly.

In summary, in this scheme, because the sub-pipelines of two adjacent single batteries are difficult to be coaxial, when grafting, the sub-pipeline may be caused to displace relative to the lower cover plate, or the lower cover plate may be caused to displace relative to the cylinder, and further the battery is damaged.

Disclosure of Invention

The utility model aims to provide a high-capacity battery, which solves the problem that the existing high-capacity battery sharing pipeline assembly is difficult to assemble.

The technical scheme of the utility model is as follows:

the high-capacity battery is characterized in that: the solar cell comprises a shell and n single cells, wherein the n single cells are sequentially connected in parallel and are arranged in an inner cavity of the shell; each single battery cavity comprises an electrolyte area and a gas area; wherein n is an integer of 2 or more;

the bottom of the shell is provided with an electrolyte sharing cavity; the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries;

the side wall of the shell is provided with a gas sharing cavity; the gas sharing chamber is communicated with the gas areas in the inner cavities of the single batteries.

Further, the bottom of the shell of each single battery is provided with a first through hole penetrating through the inner cavity of the shell; the side wall of the shell of each single battery is provided with a second through hole penetrating through the inner cavity of the shell;

the shell is a square shell and comprises a cylinder body, a first cover plate and a second cover plate;

defining the length direction of the shell as the x direction, the width direction of the shell as the y direction and the height direction of the shell as the z direction;

the bottom and the top of the cylinder body are open;

the side wall of the cylinder body, which is parallel to the xz plane, is provided with a gas sharing chamber, and the gas sharing chamber is communicated with the gas areas of the inner cavities of all the single batteries through a second through hole;

an electrolyte sharing chamber is arranged on the first cover plate; the first cover plate covers the open end of the bottom of the cylinder and is in sealing connection with the open end, and the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of all the single batteries through a first through hole;

a third through hole which can enable each single battery pole to extend out is formed in the second cover plate; the second cover plate covers the open end of the top of the cylinder body and is connected with the open end in a sealing way; each single battery pole extends out of the third through hole, and the edge of the third through hole is sealed with the single battery shell.

Further, in order to make the structure of the high-capacity battery more regular, the first cover plate is provided with two support ribs extending along the x direction, and the two support ribs and a first cover plate area between the two support ribs form an electrolyte sharing chamber.

Further, a first partition plate parallel to the xz plane is arranged in the inner cavity of the cylinder body, and the inner cavity of the cylinder body is divided into a first cavity and a second cavity; the single batteries are arranged in the first cavity; the second chamber is used as a gas sharing chamber; the gas sharing chamber is communicated with the gas areas of the inner cavities of the single batteries through the second through holes.

Further, the cylinder body further comprises a plurality of second partition plates which are arranged in the first cavity, parallel to the yz plane and distributed along the x direction, and the first cavity is divided into a plurality of single battery mounting cavities by the plurality of second partition plates; each single battery installation cavity is internally fixed with a single battery.

Further, the second cover plate comprises n sub second cover plates corresponding to the n single batteries one by one; a third through hole which can enable the corresponding single battery pole to extend out is formed in each sub second cover plate; the n sub second cover plates are respectively covered at the top open ends of the single battery installation cavities and are in sealing connection with the open ends, and the corresponding single battery poles extend out of the third through holes and the edges of the third through holes are sealed with the single battery shell.

Further, the cylinder is integrally formed by adopting an extrusion process; or the cylinder is formed by splicing at least two sub-cylinders; each sub-cylinder is integrally formed by adopting an extrusion process.

Further, the electrolyte sharing chamber is provided with a liquid injection port.

The beneficial effects of the utility model are as follows:

1. according to the utility model, a plurality of single batteries are arranged in one shell with an electrolyte sharing cavity at the bottom, and the electrolyte sharing cavity is communicated with the inner cavities of the single batteries in the shell, so that the electrolyte sharing of the single batteries ensures the consistency of the single batteries, namely, the electrolyte cavities of the single batteries are communicated, the electrolytes of all the single batteries are in the same system, the difference among the electrolytes of the single batteries is reduced, the consistency among the single batteries is improved to a certain extent, and the cycle life of the large-capacity battery is improved to a certain extent.

According to the utility model, the electrolyte sharing chamber does not need to be spliced, the problem of coaxial splicing is not required to be considered in the arrangement direction of the single batteries, and the requirements on the processing precision and the assembly precision are low; meanwhile, a special tool is not needed, the assembly process is simpler, the processing difficulty and the processing cost of the high-capacity battery with the shared system are greatly reduced, and batch production can be realized.

Meanwhile, the side wall of the shell is also provided with a gas sharing cavity, and the gas sharing cavity is communicated with the gas areas of the inner cavities of all the single batteries in the shell to achieve gas balance, so that the gas sharing of all the single batteries further ensures the consistency of all the single batteries, and the cycle life of the battery can be further prolonged relative to the high-capacity battery in the background technology.

2. The shell is of a split structure and comprises a cylinder body capable of containing a plurality of single batteries, and the first cover plate and the second cover plate which are used for sealing the open end of the cylinder body, the shell is of a split structure, after the first cover plate is fixed at the open end of the bottom of the cylinder body, each single battery can be placed in an inner cavity of the shell from the open end of the top of the cylinder body, the assembly is convenient, in addition, the cylinder body can be integrally formed by adopting an extrusion process, and the processing cost is low while the processing is convenient.

3. According to the utility model, the supporting ribs are arranged on the first cover plate to form the electrolyte sharing chamber, and the first partition plate is arranged in the cylinder to form the gas sharing chamber, so that the structure of the whole high-capacity battery is more regular, and on one hand, the integrated energy storage device based on the high-capacity battery is easy; on the other hand, the insulating film (also referred to as a blue film or a protective film) can be coated on the outer surface of the battery as a whole, thereby improving the overall safety performance of the high-capacity battery.

4. According to the utility model, the inner cavity of the cylinder body is divided into a plurality of single battery mounting cavities by additionally arranging the partition plates, and when each single battery is fixed in the corresponding single battery mounting cavity, the side wall is in direct contact with the partition plates, so that the mounting stability of each single battery in the shell can be improved on the first aspect; in the second aspect, the problem of degradation of the cycle performance of the large-capacity battery due to swelling of the individual unit batteries can be prevented; in the third aspect, heat generated in the charge and discharge processes of each single battery can be transmitted to the outside through the separator, so that the risk of thermal runaway is reduced; the fourth aspect may also enhance the strength of the barrel.

Drawings

Fig. 1 is a schematic view of a structure of a large-capacity battery in the related art;

fig. 2 is a schematic structural view of a large-capacity battery of embodiment 1;

fig. 3 is a schematic structural view of each unit cell constituting a large-capacity battery according to embodiment 1;

fig. 4 is an exploded view of the large-capacity battery of example 1;

FIG. 5 is a schematic view of the structure of a first cover plate and an electrolyte sharing chamber in embodiment 1;

FIG. 6 is a schematic view showing the structure of another first cover plate and electrolyte sharing chamber in embodiment 1;

fig. 7 is a schematic structural diagram of a second cover plate in embodiment 1;

FIG. 8 is a schematic view of the structure of a barrel in embodiment 1;

fig. 9 is a sectional view of a large-capacity battery in embodiment 1;

FIG. 10 is a schematic view of a cylinder structure with a second separator in embodiment 2;

FIG. 11 is a schematic view of another cylinder structure with a second separator in embodiment 2;

fig. 12 is a cross-sectional view of a high-capacity battery having a sealing assembly in example 2;

the reference numerals in the drawings are: 1. a housing; 2. a single battery; 3. a second through hole; 4. a cylinder; 5. a first cover plate; 6. a second cover plate; 7. an electrolyte sharing chamber; 8. a gas sharing chamber; 9. a third through hole; 10. a fourth through hole; 11. a support rib; 12. a first separator; 13. a first chamber; 14. a second chamber; 15. a fifth through hole; 16. a first through hole; 17. a second separator; 18. a seal assembly;

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by "top, bottom" or the like in terms are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first, second, third, fourth, fifth and sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model provides a high-capacity battery, which comprises a shell and a plurality of parallel single batteries arranged in the shell, wherein each single battery inner cavity comprises an electrolyte area and a gas area. The single battery can be a square shell battery or a plurality of commercially available parallel soft package batteries. The shell structure and the specific arrangement mode of each single battery in the shell can be set according to specific requirements, for example, the shell can be a square shell, and each single battery can be sequentially arranged along the length direction of the shell; the shell can also be a cylindrical hollow shell, and each single battery can be arranged in the shell in an annular arrangement mode. However, compared with a square shell, the stability of the square shell battery in the cylindrical hollow shell is difficult to ensure, and in addition, the energy density of the energy storage device formed by the large-capacity battery is general, but the large-capacity battery with the structure has better heat radiation performance.

The utility model is provided with an electrolyte sharing chamber at the bottom of the shell; the electrolyte sharing chamber is communicated with electrolyte areas of the inner cavities of the single batteries; a gas sharing chamber is arranged on the side wall of the shell; the gas sharing chamber is communicated with the gas area of the inner cavity of each single battery.

The electrolyte sharing chamber is an electrolyte accommodating chamber, and after the electrolyte sharing chamber is communicated with the electrolyte areas in the inner cavities of the single batteries, the electrolyte is required to be ensured not to be in contact with the external environment in the whole large-capacity battery.

The utility model will be described in detail with reference to the accompanying drawings and specific embodiments.

The following examples are described in detail mainly using a square-case battery as a unit cell.

Example 1

As shown in fig. 2 and 3, the large-capacity battery of the present embodiment includes 9 parallel single batteries 2, and the number of the other embodiments can be adjusted according to actual requirements. The single battery 2 is a square shell battery and comprises an upper cover plate, a lower cover plate, a cylinder body and a battery cell assembly; the cell assembly may also be referred to herein as an electrode assembly, which is assembled by sequentially arranging a positive electrode, a separator, and a negative electrode, using a lamination or winding process. The upper cover plate, the cylinder body and the lower cover plate form a single battery 2 shell, and the battery cell assembly is arranged in the single battery 2 shell. Each of the cells 2 has an inner chamber including an electrolyte region and a gas region. A first through hole 16 (see fig. 9) penetrating through the inner cavity of the shell is formed in the bottom of the shell of each single battery 2, and a second through hole 3 penetrating through the inner cavity of the shell of each single battery 2 is formed in the side wall of the shell of each single battery 2.

In this embodiment, the housing 1 is a square housing, for convenience of description, the length direction of the housing 1 is defined as the x direction, the width direction of the housing 1 is defined as the y direction, and the height direction of the housing 1 is defined as the z direction;

the following two structural forms of the housing 1 may be adopted:

1. the shell 1 is of a split structure and comprises a square cylinder with an open top and a cover plate for covering the open end; the bottom of the cylinder body is provided with an electrolyte sharing chamber; the side wall (the side wall parallel to the xz plane) of the cylinder body is provided with a gas sharing chamber; after the single batteries are placed in the cylinder, the top open end of the cylinder is sealed by the cover plate (each single battery pole needs to extend out of the cover plate), so that the electrolyte is prevented from contacting the outside.

The main body structure of the cylinder body can be formed in a die-casting or stamping mode.

2. The shell 1 is of a split structure, and comprises a cylinder body 4 with an open top and an open bottom, a first cover plate 5 and a second cover plate 6 for covering two open ends, as shown in fig. 4; the first cover plate 5 is provided with an electrolyte sharing chamber 7 which covers the bottom open end of the cylinder 4; the side wall (the side wall parallel to the xz plane) of the cylinder 4 is provided with a gas sharing chamber 8; as mentioned above, after the unit cells 2 are placed in the cylinder 4, the open top end of the cylinder 4 is sealed by the second cover plate 6 (the posts of each unit cell 2 need to extend out of the cover plate), so as to ensure that the electrolyte does not contact with the outside.

Such a cylinder 4 structure may be formed by means of aluminium extrusion.

The first cover plate 5 may adopt different structural forms, but needs to ensure the tightness of the connection part between the first cover plate 5 and the bottom open end of the cylinder 4 when the first cover plate covers the bottom open end of the cylinder 4, and needs to ensure that the inner cavity of the electrolyte sharing chamber 7 arranged on the first cover plate 5 is communicated with the electrolyte areas of the inner cavities of the single batteries 2. In this embodiment, the first cover plate 5 is welded to the edge of the open end at the bottom of the cylinder 4, so as to ensure the tightness between the first cover plate and the cylinder, and the first through hole 16 penetrating through the inner cavity of each single battery 2 is formed at the bottom of the casing of each single battery 2, so that the inner cavity of the electrolyte sharing chamber 7 is penetrated with the electrolyte area of the inner cavity of each single battery 2.

The first cover plate 5 and the electrolyte sharing chamber 7 may have the following two structures:

1. as shown in fig. 5, the first cover plate 5 is a flat plate, the electrolyte sharing chamber 7 is a tubular integral piece with the flat plate, and the integral piece can be formed by adopting an aluminum extrusion process as well as the cylinder 4, so that the integral piece has lower cost compared with the mode of separately welding the first cover plate and the electrolyte sharing chamber 7. Preferably, the shape of the flat plate is matched with the shape of the bottom open end of the cylinder 4, in this embodiment, the flat plate is a square cylinder 4, so that the area of the flat plate is slightly larger than the area of the bottom open end of the cylinder 4, and the flat plate is fixed at the bottom open end of the cylinder 4 in a fusion welding manner; the area can be slightly smaller than the area of the bottom open end of the cylinder 4, and the bottom open end of the cylinder 4 is fixed by means of caulking. The electrolyte sharing chamber 7 may have a square cross section or a circular cross section. The first cover plate 5 and the electrolyte sharing chamber 7 are provided with fourth through holes 10, and it should be noted that the number of the fourth through holes 10 may be multiple and equal to that of the single batteries 2, and each fourth through hole 10 corresponds to and penetrates through the first through hole 16 one by one; it is also possible to provide a long fourth through hole 10 extending in the longitudinal direction of the electrolyte sharing chamber 7 directly in the first cover plate 5 and the electrolyte sharing chamber 7, and the size of the fourth through hole 10 needs to be ensured, so that the fourth through hole 10 is communicated with the first through holes 16 of all the unit cells 2 when the first cover plate 5 is welded to the bottom open end of the cylinder 4.

2. As shown in fig. 6, the first cover plate 5 is a flat plate, two supporting ribs 11 extending along the x direction are arranged on the first cover plate 5, and grooves are formed in the two supporting ribs 11 and the area of the first cover plate 5 between the two supporting ribs 11 to form an electrolyte sharing chamber 7.

Compared with the first scheme, the first cover plate can enable the structure of the high-capacity battery to be more regular; when the first cover plate 5 is fixed at the bottom open end of the cylinder 4, the fourth through hole 10 is not required to be arranged, the processing procedure is simple, and the electrolyte sharing chamber 7 can be communicated with electrolyte areas in the inner cavities of all the single batteries 2 through the first through hole 16.

In this embodiment, the electrolyte sharing chamber 7 may be further provided with a liquid injection port, and when the inner cavities of the individual unit cells 2 are communicated with the electrolyte sharing chamber 7, electrolyte may be injected into the inner cavities of the individual unit cells 2 and the electrolyte sharing chamber 7 through the liquid injection port again, so as to ensure continuity of the electrolyte, and the liquid exchange may be realized through the liquid injection port in the later stage.

In the case of not pouring liquid, the pouring port needs to be sealed by a plug.

The structure of the second cover plate 6 in this embodiment is shown in fig. 7, and the second cover plate 6 is provided with a third through hole 9 which can enable the pole of each single battery 2 to extend out; the second cover plate 6 covers the open end of the top of the cylinder 4 and is connected with the open end in a sealing way; preferably, the shape of the second cover plate 6 is matched with the shape of the open end of the top of the cylinder 4, in this embodiment, the square cylinder 4 is formed, so that the area of the square plate can be slightly larger than the area of the open end of the top of the cylinder 4, and the square plate is fixed at the open end of the top of the cylinder 4 in a fusion welding manner; the area can be slightly smaller than the area of the open end of the top of the cylinder 4, and the area can be fixed at the open end of the top of the cylinder 4 in a caulking manner. The edge of the third through hole 9 is fixedly sealed with the shell of the peripheral area of the pole.

The following two structural forms can be adopted to arrange the gas sharing chamber 8 on the side wall of the cylinder 4:

1. a first partition plate 12 parallel to the xz plane is arranged in the inner cavity of the cylinder body 4, and the inner cavity of the cylinder body 4 is divided into a first cavity 13 and a second cavity 14; arranging the unit cells 2 in the first chamber 13; the second chamber 14 acts as a gas sharing chamber 8; the gas sharing chamber 8 is communicated with the gas area of the inner cavity of each single battery 2 through a second through hole 3 formed on the side wall of each single battery.

As shown in fig. 8, the first separator 12 may have a size similar to that of the cylinder 4 in the z-direction such that the upper and lower ends of the first separator 12 are in contact with the second cover plate 6 and the first cover plate 5, respectively. In this case, the first separator 12 needs to be provided with a fifth through hole 15 penetrating the second through hole 3 to ensure that the gas sharing chamber 8 penetrates the gas area of the inner chamber of each unit cell 2.

As shown in fig. 9, in the z direction, the size of the first partition plate 12 may be designed to be smaller than the size of the cylinder 4, that is, the upper end of the first partition plate 12 is lower than the second through holes 3, and at this time, the gas sharing chamber 8 may be communicated with the gas area of the inner cavity of each unit cell 2 without forming the fifth through holes 15 in the first partition plate 12.

2. A sixth through hole penetrating the second through hole 3 is formed in the side wall parallel to the xz plane of the cylinder 4, the gas sharing chamber is fixed on the outer surface of the sixth through hole, a square box body or a tubular structure can be adopted, and the through hole penetrating the sixth through hole is formed in the side wall, in contact with the cylinder 4, of the gas sharing chamber.

Compared with the structure of the scheme II, the integral structure of the scheme I is more regular, and on one hand, the integrated energy storage equipment based on the high-capacity battery is easy; on the other hand, the insulating film (also referred to as a blue film or a protective film) can be coated on the outer surface of the battery as a whole, thereby improving the overall safety performance of the high-capacity battery.

The large-capacity battery of this embodiment can be prepared by the following procedure:

step one, processing the shell 1, comprising a cylinder 4, a first cover plate 5 with an electrolyte sharing chamber 7 and a second cover plate 6 with a third through hole 9.

And step two, sealing and welding a first cover plate 5 with an electrolyte sharing chamber 7 at the bottom open end of the cylinder 4.

Step three, capacity-dividing sorting is carried out, and a plurality of single batteries 2 meeting the requirements are screened; the bottom of the single battery 2 shell is provided with a first through hole 16 and then sealed by a sealing component 18; the side wall of the single battery 2 is provided with a second through hole 3 and then sealed by a sealing component 18; arranging a plurality of single batteries 2 with sealing assemblies 18 at the first through holes 16 and the second through holes 3 in the cylinder 4 of the second step; the first through holes 16 with the sealing assemblies 18 correspond to the grooves serving as the electrolyte sharing chambers 7, so that the inner cavity electrolyte areas of the single batteries 2 are communicated with the electrolyte sharing chambers 7 after the sealing assemblies 18 are opened by external force or electrolyte; the second through holes 3 with the sealing assemblies 18 correspond to the gas sharing chambers 8, so that after the sealing assemblies 18 are opened by external force, the gas areas of the inner cavities of the single batteries 2 are communicated with the gas sharing chambers 8;

the seal assembly 18 may be the seal assembly disclosed in chinese patent CN218525645U, CN 218525614U.

It should be noted that: when the gas sharing chamber 8 structure shown in fig. 8 is adopted, if the selected sealing component 18 protrudes out of the second through hole 3 (such as the sealing component 18 with the traction ring in CN 218525645U), the single battery 2 cannot be installed in the first chamber 13; if a sealing film that can be dissolved in an electrolyte is selected as a sealing member (for example, a sealing film with a protective film in CN 218525645U), the size of the gas sharing chamber in the z direction is similar to the cylinder size, so that when the sealing member is dissolved by the electrolyte, a lot of electrolyte is consumed, and in addition, the penetration effect between the gas area of each unit cell and the gas sharing chamber may be affected. Therefore, to overcome such a problem, the sealing assembly 18 may be sealed on the fifth through hole 15 (the sealing assembly 18 is similar to a sealing assembly with a traction ring or a weak part protruding from the fifth through hole and openable by external force), so that after the sealing assembly 18 is opened by external force, the inner cavity gas area of each single battery 2 and the gas sharing chamber 8 are communicated; in this case, the third step is preferably carried out in an environment having a dew point of-20 ℃ to-40 ℃ and a humidity of 1% or less, a temperature of 23 ℃ 2 ℃ and a cleanliness of 10 ten thousand.

And fourthly, sealing and welding the second cover plate 6 at the open end of the top of the cylinder body 4, enabling each pole to extend out of the corresponding third through hole 9, and welding the edge area of the third through hole 9 with the shell of the peripheral area of the pole in a welding mode to realize sealing.

And fifthly, opening the sealing assembly 18 by using external force or electrolyte, wherein the inner cavity of the electrolyte sharing chamber 7 is communicated with the electrolyte areas of the inner cavities of the single batteries 2, and the inner cavity of the gas sharing chamber 8 is communicated with the gas areas of the inner cavities of the single batteries 2.

In other embodiments, the first cover plate 5 and the bottom open end of the cylinder 4, the second cover plate 6 and the top open end of the cylinder 4 may be fixed by using an adhesive or screw connection, but the tightness or connection reliability is relatively weak compared with the welding manner.

After the inner cavities of the single batteries 2 and the electrolyte sharing chamber 7 are communicated, the electrolyte in the inner cavities of the single batteries 2 is communicated through the electrolyte sharing chamber 7, and in order to prevent the phenomenon of electrolyte interruption, the electrolyte can be injected into the electrolyte sharing chamber 7 after the inner cavities of the single batteries 2 and the electrolyte sharing chamber 7 are communicated so as to ensure the continuity of the electrolyte.

All the unit cells 2 are then connected in parallel. In other embodiments, each cell 2 may be connected in parallel between step four and step five.

In order to form a more complete SEI film, the high-capacity battery has more stable circulation capacity, and after electrolyte is injected into the inner cavities of all the single batteries 2 through the electrolyte sharing chamber 7, the whole high-capacity battery is formed.

Example 2

As shown in fig. 10 and 11, unlike embodiment 1, this embodiment is provided with a plurality of second separators 17 arranged in the x direction in the inner cavity of the cylinder 4.

In fig. 10, the upper end of the first partition 12 is lower than the second through hole 3 in the z direction, the size of the second partition 17 in the y direction is similar to the size of the cylinder 4, the first chamber 13 is divided into a plurality of unit cell 2 mounting chambers, the first partition 12 is divided into a plurality of first sub-partitions, and the second chamber 14 is divided into a plurality of small gas chambers. The second partition 17 in the second chamber 14 is perforated to ensure the communication of the gases of the plurality of small gas chambers, and it is necessary to ensure that the sealing member 18 sealed at the second through hole 3 can be smoothly opened by external force or the electrolyte itself. It is also possible to provide the second partition 17 only in the first chamber as shown in fig. 11, but the structural strength of the second chamber is weaker than that of the structure shown in fig. 10.

In addition, as shown in fig. 12, in order to improve the stability of the second partition 17, a clamping groove extending along the z direction may be formed on the two support ribs 11, and the bottom edge of the second partition 17 may be clamped into the clamping grooves of the two support ribs 11. However, it is necessary to ensure the penetrability of the electrolyte-sharing chamber 7. For example, the second partition 17 may be perforated or the size of the second partition 17 in the z-direction may be reduced so that a gap is provided between the lower end of the second partition 17 and the bottom of the cylinder 4. At the same time, it is necessary to ensure that the sealing member 18 sealed at the first through hole 16 can be smoothly opened by an external force or the electrolyte itself. As shown in fig. 12, the sealing component 18 is a sealing component with a weak portion protruding from the first through hole 16, and the through hole is formed in the second partition 17 of the electrolyte sharing chamber 7, so that an external unpacking tool or a special tool can pass through the sealing component, and then the weak portion of the sealing component 18 is shoveled off, and the sealing component 18 is opened, so that the electrolyte area of the inner cavity of each single battery 2 is communicated with the electrolyte sharing chamber 7.

A single battery 2 is fixed in the installation cavity of each single battery 2, the side walls of the two sides of each single battery 2 close to the middle part are respectively contacted with two adjacent second partition plates 17, the two single batteries 2 close to the outermost side are contacted with one side wall and the second partition plate 17, and the other side wall is contacted with the side wall of the cylinder body 4, so that the installation stability of each single battery 2 in the shell can be improved on the first aspect; in the second aspect, the problem of degradation of the cycle performance of the large-capacity battery due to swelling of the individual unit cells 2 can be prevented; in the third aspect, heat generated during the charge and discharge of each unit cell 2 can be transmitted to the outside through the second separator 17, reducing the risk of occurrence of thermal runaway; the fourth aspect may also enhance the strength of the cylinder 4.

Two or more single batteries 2 can be fixed in each single battery 2 installation cavity.

When the length of the square cylinder 4 along the x direction is long and is difficult to finish by one-time extrusion, two or more sub square cylinders can be extruded first, and then the sub square cylinders are spliced and welded to form the square cylinder 4 with the required size. For the large-capacity battery in embodiment 1, two sub square cylinders capable of accommodating five unit batteries 2 may be extruded, wherein one more unit battery 2 installation cavity may be used as an electrolyte reservoir. The electrolyte storage bin is communicated with the electrolyte sharing chamber and is used for filling electrolyte into the high-capacity battery.

In addition, when one single battery 2 is fixed in the installation cavity of each single battery 2, the second cover plate 6 may be set to be a split structure, and includes sub second cover plates 6 corresponding to the plurality of single batteries 2 one by one; as can be seen from fig. 2, each sub-second cover plate 6 is provided with a third through hole 9 which can enable the pole of the corresponding single battery 2 to extend out; the n sub second cover plates 6 are respectively covered at the open ends of the top of the installation cavity of the single battery 2 and are in sealing connection with the open ends, the corresponding single battery 2 pole extends out of the third through hole 9, and the edges of the third through hole 9 are fixedly sealed with the shell in the peripheral area of the pole.

Claims (9)

1. A high capacity battery characterized by: the solar cell module comprises a shell (1) and n single cells (2), wherein the n single cells (2) are sequentially connected in parallel and are arranged in an inner cavity of the shell (1); each single battery (2) inner cavity comprises an electrolyte area and a gas area; wherein n is an integer of 2 or more;

an electrolyte sharing chamber (7) is arranged at the bottom of the shell (1); the electrolyte sharing chamber (7) is communicated with the electrolyte areas in the inner cavities of the single batteries (2);

the side wall of the shell (1) is provided with a gas sharing cavity (8); the gas sharing chamber (8) is communicated with the gas area in the inner cavity of each single battery (2).

2. The high-capacity battery according to claim 1, wherein: the bottom of the shell of each single battery (2) is provided with a first through hole (16) penetrating through the inner cavity of the shell; the side wall of the shell of each single battery (2) is provided with a second through hole (3) penetrating through the inner cavity of the shell;

the shell (1) is a square shell and comprises a cylinder body (4), a first cover plate (5) and a second cover plate (6);

defining the length direction of the shell (1) as the x direction, the width direction of the shell (1) as the y direction and the height direction of the shell (1) as the z direction;

the bottom and the top of the cylinder body (4) are open;

the side wall of the cylinder body (4) parallel to the xz plane is provided with a gas sharing chamber (8), and the gas sharing chamber (8) is communicated with the gas areas in the inner cavities of the single batteries (2) through second through holes (3);

an electrolyte sharing chamber (7) is arranged on the first cover plate (5); the first cover plate (5) covers the bottom open end of the cylinder body (4) and is connected with the open end in a sealing way, and the electrolyte sharing chamber (7) is communicated with the electrolyte areas in the inner cavities of the single batteries (2) through the first through holes (16);

a third through hole (9) which can enable the pole of each single battery (2) to extend out is formed in the second cover plate (6); the second cover plate (6) covers the open end of the top of the cylinder (4) and is connected with the open end in a sealing way; the poles of the single batteries (2) extend out of the third through holes (9), and the edges of the third through holes (9) are fixedly sealed with the single battery shell.

3. The high-capacity battery according to claim 2, wherein: two support ribs (11) extending along the x direction are arranged on the first cover plate (5), and the two support ribs (11) and a first cover plate (5) area between the two support ribs (11) form an electrolyte sharing chamber (7).

4. The high-capacity battery according to claim 2, wherein: a first partition board (12) which is parallel to the xz plane is arranged in the inner cavity of the cylinder body (4), and the inner cavity of the cylinder body (4) is divided into a first cavity (13) and a second cavity (14); the single batteries (2) are arranged in the first cavity (13); the second chamber (14) acts as a gas sharing chamber (8).

5. The high-capacity battery as claimed in claim 4, wherein: the cylinder body (4) further comprises a plurality of second partition plates (17) which are arranged in the first chamber (13) and parallel to the yz plane and distributed along the X direction, and the first chamber (13) is divided into a plurality of single battery (2) installation cavities by the plurality of second partition plates (17); each single battery (2) is fixed in the installation cavity.

6. The high-capacity battery according to claim 5, wherein: the second cover plate (6) comprises n sub second cover plates (6) which are in one-to-one correspondence with the n single batteries (2); a third through hole (9) which can enable the pole of the corresponding single battery (2) to extend out is formed in each sub second cover plate (6); n sub second cover plates (6) are respectively covered at the open ends of the top parts of the installation cavities of the single batteries (2) and are in sealing connection with the open ends, and the corresponding single batteries (2) pole posts extend out of the third through holes (9) and the edges of the third through holes (9) are sealed with the single battery shell.

7. The high-capacity battery according to claim 2, wherein: the cylinder body (4) is integrally formed by adopting an extrusion process.

8. The high-capacity battery according to claim 2, wherein: the cylinder body (4) is formed by splicing at least two sub-cylinder bodies (4); each sub-cylinder (4) is integrally formed by adopting an extrusion process.

9. The high-capacity battery according to claim 1, wherein: the electrolyte sharing chamber (7) is provided with a liquid injection port.